No problem Jim.
I was not aware that there were ones that had a different plug.
One thing I would advise to check is the date of manufacture, don't buy one that's been sitting on a shelf for 12 years
I was aware that some have a different method of mounting, I think onehundred80 pointed that out.

Yes, you can unplug the alarm and the lights will still flash and it will not effect your battery.
George